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<html><head><style>#aside{ width:250px; height:auto; background-color:rgb(250,250,250); }#aside ul{ list-style-type:none; padding:0px; margin:0px; border-radius:5px;}</style></head><body><h2 id="aside-heading">This is a heading</h2><aside id="aside"> <ul> <li><a href="#">List item1</a></li> <li><a href="#">List item2</a></li> <li><a href="#">List item3</a></li> <li><a href="#">List item4</a></li> </ul></aside></body></html>